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GMA 240
Installation Manual
190-00917-01 September, 2015 Revision E
© 2015
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: 913.397.8200
Aviation Panel-Mount Technical Support Line (Toll Free) 1.888.606.5482
www.garmin.com
Garmin (Europe) Ltd.
Liberty House, Hounsdown Business Park
Southampton, Hampshire SO40 9LR U.K.
+44/ (0) 23 8052 4000
Garmin AT, Inc.
2345 Turner Rd., SE
Salem, OR 97302 USA
Telephone: 503.581.8101
RECORD OF REVISIONS
Revision Revision Date
A
B
06/09/08
01/18/11
C
D
E
04/13/11
06/16/12
09/29/15
Description
Initial Release
Clarified backlighting info
Clarified mono/stereo headset switch info
Corrected temperature range spec
Updated lighting bus info and interconnect drawings
AVIATION LIMITED WARRANTY
GMA 240 warranty information is available at garmin.com/aviationwarranty .
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Page A
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration Regulations
("EAR") issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and which may not be exported, released, or disclosed to foreign nationals inside or outside of the United States without first obtaining an export license. The preceding statement is required to be included on any and all reproductions in whole or in part of this manual.
DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES
WARNING
Warnings are used to bring to the installer’s immediate attention that not only damage to the equipment but personal injury may occur if the instruction is disregarded.
CAUTION
Cautions are used to alert the individual that damage to equipment may result if the procedural step is not followed to the letter.
NOTE
Notes are used to expand and explain the preceding step and provide further understanding of the reason for the particular operation.
WARNING
This product, its packaging, and its components contain chemicals known to the State of
California to cause cancer, birth defects, or reproductive harm. This Notice is being provided in accordance with California's Proposition 65. If you have any questions or would like additional information, please refer to our web site at www.garmin.com/prop65 .
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Revision
E
Page
Number
2-3, 2-4
4-5
B-1–B-3
CURRENT REVISION DESCRIPTION
Section
Number
Description of Change
Updated/added volume/mute adjustments info
Updated lighting bus info
Updated interconnect drawing to show both J & P connectors
GMA 240 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GMA 240 Audio
Panel. Mod Levels are listed with the associated service bulletin number, service bulletin date, and the purpose of the modification. The table is current at the time of publication of this manual (see date on front cover) and is subject to change without notice. Authorized Garmin Sales and Service Centers are encouraged to access the most up-to-date bulletin and advisory information on the Garmin Dealer
Resource web site at www.garmin.com using their Garmin-provided user name and password.
Mod
Level
Service
Bulletin
Number
Service
Bulletin Date
Purpose Of Modification
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TABLE OF CONTENTS
PARAGRAPH PAGE
Section 1 GENERAL DESCRIPTION .............................................................1-1
Section 2 INSTALLATION OVERVIEW........................................................2-1
Section 3 INSTALLATION PROCEDURE.....................................................3-1
Section 4 SYSTEM INTERCONNECTS..........................................................4-1
Appendix A Outline and Installation Drawings .............................................A-1
Appendix B Interconnect Drawings.................................................................B-1
Appendix C Configuration Jumpers Drawing................................................C-1
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LIST OF FIGURES
FIGURE PAGE
Section 1 GENERAL DESCRIPTION .............................................................1-1
Section 2 INSTALLATION OVERVIEW........................................................2-1
Figure 2-3 GMA 340 (used for GMA 240) Unit Rack (115-00262-00)............................... 2-6
Section 3 INSTALLATION PROCEDURE.....................................................3-1
Section 4 SYSTEM INTERCONNECTS..........................................................4-1
Figure 4-2 Rear Connectors J2401 & J2402, Viewed from Back of Unit............................ 4-1
Appendix A Outline and Installation Drawings .............................................A-1
Figure A-3 GMA 240 Recommended Panel Cutout Dimensions........................................ A-3
Appendix B Interconnect Drawings ................................................................B-1
Figure B-2 GMA 240, J2401 & J2402 Connector Layout Drawing ....................................B-4
Appendix C Configuration Jumpers Drawing................................................C-1
Figure C-1 GMA 240 Internal Configuration Jumper Layout Drawing...............................C-1
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LIST OF TABLES
TABLE PAGE
Section 1 GENERAL DESCRIPTION .............................................................1-1
Section 2 INSTALLATION OVERVIEW........................................................2-1
Section 3 INSTALLATION PROCEDURE.....................................................3-1
Section 4 SYSTEM INTERCONNECTS..........................................................4-1
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1 GENERAL DESCRIPTION
1.1 Introduction
This manual provides the installation instructions for the Garmin GMA 240 Audio Panel. References to
GMA 240 throughout this manual refer to all versions of the unit. Information pertaining to the maintenance of the unit can be found in the GMA 240 Maintenance Manual, P/N 190-00917-02.
Information pertaining to the operation of the unit can be found in the GMA 240 Pilot's Guide, P/N
190-00917-00.
1.2 Equipment Description
The Garmin GMA 240 Audio Panel is not a TSO-certified product and has received no FAA approval or endorsement.
The GMA 240 meets the needs of aircraft owners and operators who require reliability and versatility in the essential audio switching function. LED-illuminated push-button simplicity and intuitive panel layout allow audio selection of both NAV and COM audio. Large, single-button activation of the COM microphone and audio for two COM transceivers simplifies cockpit workload. Photocell dimming circuitry automatically adjusts the brightness of the annunciators to a level appropriate for ambient cockpit light. The brightness of the backlighting is controlled by the aircraft lighting bus. A fail-safe circuit connects the pilot's headset and microphone directly to COM1 and a fail-safe warning audio input in the event that power is interrupted or the unit is turned off.
Additionally, the GMA 240 includes a four-position intercom (ICS) with electronic cabin noise deemphasis, two stereo music inputs, and independent pilot and copilot/passenger volume controls. To further simplify the cockpit workload, the intercom provides for pilot isolation. One hundred percent solid state circuitry and extensive use of surface mount technology are employed.
Figure 1-1. GMA 240 Unit View
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1.2.1 Features Summary
• User-friendly, intuitive front panel layout
• LEDs indicate selected function
• Four position intercom: pilot, copilot, two passengers
• Two stereo headset amplifiers: one for pilot, one for copilot/passengers
• Two differential stereo music source inputs
• Front panel music volume control, source selection, and master music on/off switch
• Front panel controls for music muting by intercom and selected radios
• Two selectable intercom operational modes
• Selectable aural pushbutton annunciation (beep)
• Independent pilot, copilot/passenger intercom volume and squelch controls
• Individual VOX circuits for each of four (4) mic inputs
• Automatic selection of COM audio source when corresponding mic is selected
• Memory of explicitly selected COM audio source(s) when changing COM mic selection
• MASQ™ Processing with configurable mute threshold
• COM swap function
• PTT indication
• Power-off fail-safe to connect Pilot PTT, mic, and Headset to COM 1 if unit is turned off
• Power-off fail-safe warning audio input
• Full duplex Telephone interface
• Front Panel Mini-Jack (MP3 player, cellular phone, etc.)
1.3 Technical Specifications
1.3.1 Physical Characteristics
Table 1-1 Physical Characteristics
Characteristic
Bezel Height
Bezel Width
Rack Height (Dimple to Dimple)
Rack Width
Depth Behind Panel with Connectors (measured from face of aircraft panel to rear of connector backshells)
GMA 240 Weight (Unit Only)
GMA 240 Weight (Installed with rack and connectors)
Specification
1.30 inches (33 mm)
6.29 inches (159.77 mm)
1.33 inches (34 mm)
6.30 inches (160.02 mm)
7.12 inches (181 mm)
15.5 oz (440 g)
24 oz (680 g)
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1.3.2 Electrical Characteristics
Characteristic
Temperature
Range
Altitude
Audio Panel
Functions
Intercom Functions
Headphone
Outputs
Table 1-2 Electrical Characteristics
Specification
-20 C to +55 C (operation)
-55 C to +85 C (storage)
55,000 Feet
Dedicated Transceiver inputs: 3 (including TEL)
Dedicated Receiver inputs: 4 (all independently selectable)
Alert (unswitched) inputs: 3 (each with configurable volume)
Input impedance: 500 Ω
Input isolation: 60 dB minimum
Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.5 kHz
Special functions: Fail-safe operation
MASQ™ processing (Master Avionics Squelch)
Configurable button push aural annunciation
Positions: 4 (pilot, copilot, 2 passengers)
Volume controls: 3 (pilot, copilot/passengers, music)
VOX level controls: 2 (pilot, copilot/passengers)
VOX circuits: 4 (one per mic input)
Microphone input impedance: 450 Ω (compatible with 150 to 600 Ω mics)
Microphone bias voltage: about 10 Vdc delivered through 450 Ω
Microphone response: 9-pole characteristic cabin noise de-emphasis
Intercom isolation modes: 2 - all, pilot (or configure for all, crew)
Telephone interfaces: 1 full-duplex (use LRU pins or front jack)
Output amplifiers: 2 stereo (pilot, copilot/passengers)
Fidelity: Load Power Distortion (typ.)
150 Ω 50 mW <0.03% THD+N
150 Ω 100 mW <0.07% THD+N
50 Ω 150 mW <0.07% THD+N
50 Ω 300 mW <0.10% THD+N
Compatible with higher headphone impedances, those shown are for worst-case distortion and bandwidth
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Characteristic
Music Functions
Front Panel Mini-
Jack Functions
Table 1-2 Electrical Characteristics
Specification
Music inputs (stereo): 2
Music input impedance: 600 Ω (differential)
Music gain: -20dB @ min volume, +26dB @ max. volume (typ.)
Music input level:<200 mVrms for full power* output @ max music volume knob position (typ.)
3.5 Vrms max music input level
Music bandwidth: 20 Hz to 20 kHz @ full power output
Music distortion: <0.1% THD+N (typ.) @ full power, full bandwidth
Special Functions: Front panel selection and volume control
Front panel control for muting by radios and ICS
Muting by alerts configurable
*Full power output refers to 300 mW into 50 Ω (three 150 Ω headsets in parallel each driven to 100 mW)
Input Impedance: 5.1 kΩ
Music Input: Auto detection of music source will use jack as Music 1
Telephone Input: Auto detection of TEL source will use jack for TEL Telephone ring signal is heard without TEL selected
1.3.3 Power Requirements
Characteristic
Input Voltage Range
Power Input
Table 1-3 Power Requirements
Specification
11 to 33 Vdc
4.3 W normal operation (310mA @ 13.8 V)
7.5 W max. operation (540 mA @ 13.8 V)
1.4 Reference Documents
The following publications are sources of additional information for installing the GMA 240. Before installing the unit, the technician should read all referenced materials along with this manual.
Part Number
190-00917-00
190-00917-02
Table 1-4 Reference Documents
Document
GMA 240 Pilot's Guide
GMA 240 Maintenance Manual
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2 INSTALLATION OVERVIEW
2.1 Introduction
This section provides the necessary information for the installation and checkout of the GMA 240 Audio
Panel. Installation of the GMA 240 will differ according to equipment location and other factors. Cabling will be fabricated by the installing agency to fit these various requirements. The appendices contain interconnect wiring diagrams, mounting dimensions, and information pertaining to installation.
2.2 Installation Materials
2.2.1 Equipment Available
GMA 240 Audio Panel, Ship Level Assembly, P/N 010-00735-() includes the following, depending on part number:
Table 2-1
Item
Connector Kit, GMA 340
Rack Backplate, GMA 340
Unit Assembly, GMA 240
Audio Cables, 2.5 mm RA Stereo Plug
Install Rack, GMA 340 (used for GMA 240)
Garmin P/N
011-00652-00
011-00678-00
011-01988-00
011-02079-00
115-00262-00
2.2.2 Additional Equipment Required
• Cables: The installer will fabricate and supply all system cables. Interconnect wiring diagrams are
.
• Hardware: #6-32 100° flat head screw (6 ea.) and #6-32 self-locking nut (6 ea.). Hardware required to mount the installation rack is not provided.
• Stereo headphone jacks (up to 4), microphone jacks (up to 4), 3.5mm stereo jacks (up to 2).
Insulating type jacks or insulating washers should be used for all jacks to isolate them from aircraft chassis.
2.3 GMA 240 Wiring, Configuration, and Adjustment Options
The GMA 240 has several configuration/adjustment options, consideration of these options should be discussed with the end user(s) of the aircraft before wiring begins. These configuration/adjustments are described in the following sections:
•
Wiring options - Section 2.3.1
•
Internal configuration jumpers - Section 2.3.1
• Volume/Mute adjustments -
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2.3.1 Internal Configuration Jumpers
The following internal configuration adjustments may be made by removing or replacing jumpers on the
PCB. The jumper positions are designed to accept a 0Ω resistor of 0603 size. Refer to
for component location.
This service should only be performed by a qualified technician. Garmin is not responsible for damage caused during adjustment of these internal configuration jumper settings. Refer to the GMA 240
Maintenance Manual for disassembly/reassembly instructions.
Figure 2-1 ESD Caution Logo
NOTE
The GMA 240 contains static sensitive components. Observe proper anti-static procedures when performing any solder procedures on the unit.
Component
R0303
R0304
R0305
R0308
R0315
Name
Alert Mutes
Music
COM1
Internal
Sidetone
COM2
Internal
Sidetone
Table 2-1 Configuration Jumpers
Default
Populated
Empty
Empty
Description
If this jumper is removed, music will not be interrupted by alert audio. Default operation is recommended.
If a jumper is supplied in these positions, internal sidetone will be heard during PTT to simulate received sidetone from a radio that does not provide one during transmission. This should only be used if a radio does not perform this function already.
TEL
Internal
Sidetone
TEL jack detect bypass
Populated
Empty
If this jumper is removed, intercom audio and intercom sidetone will not be heard when the TEL button is selected. Many phones supply sidetone when a call is in session. This causes a noticeable change in intercom sound quality but it is usually not disruptive. Default operation is recommended unless the effect of sidetone from the telephone is disruptive to intercom operation.
If a jumper is supplied in this position, when TEL is selected the audio panel will assume a telephone is in use in the front jack regardless of phone detection. This should be used only if the audio panel is not capable of properly detecting the telephone that will be used in the installation.
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Component
R0314
R0313
R0312
R0309
R0302
R0301
R0300
Name
Only
Primary
COM mutes
MUSIC
Enable
KEYED
ICS
Reserved
Reserved
Reserved
Reserved
Reserved
Table 2-1 Configuration Jumpers
Default
Empty
Empty
Empty
Empty
Empty
Empty
Empty
Description
If a jumper is supplied in this position, the RADIO button will mute music only when the Primary COM (the COM selected for transmission) is receiving audio. Default
RADIO mutes music operation occurs when any selected
COM / NAV / AUX radio is receiving audio.
If a jumper is supplied in this position, the intercom system
(ICS) will only allow intercom MIC audio to be heard when the corresponding ICS KEY for the MIC position is pressed. When this configuration is used, the VOX knobs should be set fully CCW (live MIC). See
for information on wiring intercom keys.
Reserved
Reserved
Reserved
Reserved
Reserved
2.3.2 VOLUME/MUTE Configuration Adjustments
There are six access holes in the GMA 240 top cover ( Figure 2-2
) that allow access to potentiometers which can be used to make adjustments to input volume levels and the MASQ (Master Avionics SQuelch) mute level. The specific adjustments and their associated label on the back cover are:
• Alert 1 Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . ALRT 1 VOL
• Alert 2 Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . ALRT 2 VOL
• Alert 3 Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . ALRT 3 VOL
• Rear connector TEL input volume . . . . . . . . . . . . REAR TEL VOL
• Front panel jack TEL input volume. . . . . . . . . . . . FRONT TEL VOL
• MASQ (Master Avionics SQuelch) mute level . . . MUTE LVL
NOTE
Adjusting these levels is not generally needed or recommended for most installations.
For Alert 1, 2, & 3 volume inputs, rear conn TEL input, and front panel jack TEL inputs, a CW (clockwise) adjustment increases the levels for volume inputs.
For MASQ mute level, a CW (clockwise) adjustment increases the level for the mute threshold for radio inputs. MASQ circuitry functions to prevent low level noise from being passed to the headset ear speakers, this is known as “squelching” or muting the audio. To “break” or “open” squelch means that enough audio signal is present that the signal is passed through the audio circuitry and can be heard. Increasing (CW adjustment) this setting increases the signal level required to break/open squelch. If needed, adjust the
MASQ SQ level so the audio background noise is muted.
2.3.2.1 MASQ/ICS Squelch Descriptions
The Master Avionics Squelch (MASQ) mute level adjustment is a different/separate function from the ICS squelch that is controlled by the pilot/copilot squelch knobs on the unit’s front panel. MASQ is a squelch or noise threshold adjustment that applies to the radio/alert type inputs.
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The ICS (intercom) squelch (sound level that opens the mic audio for pilot/copilot/passengers) is manually adjusted by the pilot and copilot with dedicated front panel knobs, and is totally separate from MASQ.
CW rotation of the ICS adjustment knobs increases the amount of mic audio (VOX level) required to break squelch, see the GMA 240 Pilot’s Guide (190-00917-00) for details.
The MASQ affects the noise threshold for the COM, NAV, AUX, TEL, and Alert 1/2/3 audio inputs. It is factory adjusted to a level that works well for most installations, so it seldom needs to be adjusted by installers. When necessary, the MASQ is adjusted using a small screwdriver (see following note) through the MUTE LVL top access hole in the cover. For example, if one of the alert inputs has some background noise that is sometimes or always heard in the headset and causes music to be undesirably muted, raising the MASQ threshold may eliminate this issue. Anytime the MASQ is adjusted, it is very important to verify that all audio inputs, including alerts, still function correctly.
Figure 2-2 Access Hole Locations (Top View)
NOTE
Adjusting the MASQ mute level to a high level may squelch the desired audio.
NOTE
Exercise care when inserting adjustment tools through the top cover. Damage to the unit may occur if an adjustment tool is accidentally forced against unintended components or circuit board paths. Use a 2 mm (max blade width) flat-blade non-conductive screw driver or adjustment tool.
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2.3.3 Hardwire Configuration Option
The following configuration options are available by externally wiring pins to aircraft chassis. When change of operation is desired during flight, these can optionally be wired to chassis through a suitable
switch mounted in reach of the operator. See Section 4.4.1
for connector and pin details for implementing
these configuration options.
MASQ™ INHIBIT: The Master Avionics SQuelch inhibit configuration option allows selected avionics audio inputs (COM, NAV, AUX) and alerts to be heard even if they do not exceed the MASQ threshold.
This increases background noise during otherwise quiet operation because noise from these inputs is not squelched. This option is most useful as a troubleshooting tool.
CREW ISO: This input configures the audio panel for crew intercom isolation in place of pilot isolation.
When the PILOT ISO key is selected, the pilot and copilot will hear each other but will be isolated from the passengers. When the CREW ISO configuration is selected, the copilot's headphone jack must be wired in parallel with the pilot headset output. Microphones are wired as normal.
PILOT ISO MUSIC: This input configures music to be heard by the pilot during PILOT ISO mode (or by the pilot and copilot if crew isolate mode is configured). Normally, the isolated ICS positions do not hear music.
BUTTON PRESS TONE ENABLE: This input enables an audible tone to be heard when a button press is detected.
MUTE ON COM TX: This input configures the audio panel to mute all selected radios (COM, NAV,
AUX) except the mic selected COM (COM selected for transmission) when a PTT key is activated for
COM transmit.
2.4 Noise
Because the audio panel is a point in the aircraft where signals from many pieces of equipment are brought together, care must be taken to minimize effects from coupled interference and ground loops.
Coupled interference can sneak into audio system interconnecting cables when they are routed near large
AC electric fields, AC voltage sources, and pulse equipment (strobes, spark plugs, magnetos, EL displays,
CRTs, etc). Interference can also couple into audio system interconnecting cables by magnetic induction when they are routed near large AC current-carrying conductors or switched DC equipment (heaters, solenoids, fans, autopilot servos, etc).
Ground loops are created when there is more than one path in which return currents can flow, or when signal returns share the same path as large currents from other equipment. These large currents create differences in ground potential between the various equipment operating in the aircraft. These differences in potential can produce an additive effect at an audio panel signal input.
The audio panel may "see" the desired input signal plus an unwanted component injected by ground differentials, a common cause of alternator-related noise. This is the main reason why all audio jacks should be isolated from ground. Terminating audio shields just at one end eliminates another potential ground loop injection point.
Single-point grounding cannot be overstressed for the various avionics producing and processing audio signals. Single-point, in this context, means that the various pieces of equipment share a single common ground connection back to the airframe. Good aircraft electrical/charging system ground bonding is also important.
The wiring diagrams and accompanying notes in this manual should be followed closely to minimize noise effects.
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2.5 GMA 240 Mounting
The GMA 240 mounting surface must be capable of providing structural support and electrical bond to the aircraft to minimize radiated EMI and provide protection from High-Intensity Radiation Fields (HIRF).
The GMA 240 is mounted using a GMA 340 unit rack. Figure 2-3 shows the GMA 340 unit rack. See
for installation instructions.
NOTE
Rear support is recommended to ensure a sturdy mount.
Figure 2-3 GMA 340 (used for GMA 240) Unit Rack (115-00262-00)
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3 INSTALLATION PROCEDURE
3.1 Unpacking Unit
Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred during shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the original shipping container and all packing materials. Do not return the unit to Garmin until the carrier has authorized the claim.
Retain the original shipping containers for storage. If the original containers are not available, a separate cardboard container should be prepared that is large enough to accommodate sufficient packing material to prevent movement.
3.2 Electrical Connections
All electrical connections to the GMA 240 are made through two 44-pin D-subminiature connectors (see
).
Section 4 defines the electrical characteristics of all input and output signals. Required
connector and associated hardware are supplied in the connector kit (P/N 011-00652-00). See
for interconnect wiring diagrams.
Check wiring connections for errors before inserting the GMA 240 into the rack. Incorrect wiring could cause internal component damage.
Table 3-1 Pin Contact Part Numbers
Manufacturer
Garmin P/N
Military P/N
22-28 AWG
336-00021-00
M39029/58-360
Manufacturer
Military P/N
Table 3-2 Recommended Crimp Tools
Hand
Crimping Tool
M22520/2-01
High Density 22-28 AWG
Positioner
M22520/2-09
Insertion/Extraction Tool
M81969/1-04
NOTE
Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to change without notice.
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3.3 Audio Shield Termination
The audio shield wires should be terminated at the rear of the unit to the screws between J2401 and J2402
Rear View of backplate and rack
J2402 J2401
Audio shields daisy chained and terminated using a lug attached to either of these screws.
Figure 3-1 Audio Shield Termination
3.4 GMA 240 Installation
NOTE
Avoid installing the unit near heat sources. If this is not possible, ensure that additional cooling is provided. Allow adequate space for installation of cables and connectors. The installer will supply and fabricate all of the cables.
1. Assemble the connector/rack kit according to Table 4-1
.
Install the rack assembly according to the dimensions given in
.
Mounting brackets are not supplied due to the wide range of mounting configurations available.
Suitable mounting brackets may be fabricated from sheet metal or angle stock. To ensure a sturdy mount, rear support for the unit should be provided.
2. Slide the unit into the rack until the jackscrew makes contact with the receptacle located in the back plate.
3. Insert a 3/32" Allen wrench into the jackscrew access hole on the faceplate.
4. Turn the Allen wrench clockwise until the unit is secured in the rack. Continue turning until tight, but do not over-tighten.
CAUTION
Do not use excessive force when inserting the GMA 240 into the rack. This may damage the connectors, unit, and/or unit rack. If heavy resistance is felt during installation, stop, and remove the GMA 240 and identify the source of resistance.
5. To remove the unit from the rack, turn the Allen wrench counterclockwise until it disengages from the rack.
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3.5 Post Installation Checkout
CAUTION
Check wiring connections for errors before inserting the GMA 240 into the rack.
Incorrect wiring could cause internal component damage.
An in-aircraft checkout may be performed in the aircraft on the ramp with known good microphone, headset, and avionics receivers.
3.5.1 Lamp Test
1. Apply power to the unit by rotating the pilot intercom knob clockwise.
2. Verify that all annunciators on the front panel are illuminated during initial power up.
3.5.2 Failsafe Operation Check
1. Turn the unit off by rotating the pilot intercom knob fully counter clockwise.
2. Check the failsafe operation by exercising the COM 1 microphone, microphone key, and monitoring received COM 1 audio over the pilot headphone's left earpiece.
3. If installed, check that the failsafe warning is heard in the pilot headphone's left earpiece.
4. Turn the unit back on to continue testing.
3.5.3 Transceiver Operational Check
1. Perform a ramp test radio check by exercising the installed transceivers, microphone, microphone key, and audio over the headphone.
2. Verify that communications are loud and clear and PTT operation is correct.
3.5.4 Intercom System (ICS) Check
NOTE
Stereo headsets are recommended if stereo jacks are installed. Alternatively, the installation should employ stereo jacks with a mono/stereo switch that disconnects the audio panel's right channel output from the jack's ring contact when in mono mode. If a monaural headset is used in a stereo jack, the audio panel's right channel output is shorted to ground by the mono headset's plug. This causes excess power supply current to be drawn. While this does not damage the unit's output circuitry, prolonged periods
(especially at high volume) may cause the internal power input fuse to open. This is because the unit is optimized for low-power operation in systems with limited power budgets. In the case of copilot/passenger positions wired in parallel, any stereo listener will lose right channel audio when another passenger plugs in a mono headset.
1. Set the intercom to the ALL mode [Pilot ISO LED off.]
2. Plug in headsets at each ICS position.
NOTE
For helicopter operation using a two-stage Intercom/PTT switch, prior to using the keyedintercom mode, the VOX level should be set by adjusting the VOX knob while the first detent is actuated and held.
3. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch controls.
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GMA 240 Installation Manual
Page 3-3
3.5.5 Aircraft Receivers Check
1. Select the audio source corresponding to each installed avionics unit and check for audio over the headsets.
3.5.6 Music System Check
1. Set the intercom to the ALL mode [Pilot ISO LED off.]
2. Connect a stereo audio source to MUSIC 1 (ensure the front panel jack is empty and the music volume knob is not set to minimum). Verify that stereo audio is heard over all headset positions when MUSIC 1 is selected as the music source and MUSIC LED is on. Pull out on the right side small knob and verify that music volume adjustment is working properly.
3. Select an audio source to COM 1 and verify that the sound is muted by active COM 1 audio when
RADIO music mute is selected and by intercom audio when ICS music mute is selected.
4. Connect a stereo music source to MUSIC 2. Verify that stereo audio is heard when MUSIC 2 is selected as the music source and MUSIC LED is on.
5. Connect a stereo audio source to the front panel jack. Verify that stereo audio is heard when
MUSIC 1 is selected as the music source and MUSIC LED is on.
CAUTION
Be sure to check all aircraft control movements before flight is attempted to ensure that the wiring harness does not touch any moving part.
This completes the in-aircraft post installation checkout. Perform a flight test after installing the unit to ensure satisfactory performance of the audio functions.
3.6 Configuration Adjustments
Adjustment to the Volume and Squelch settings can be made to the GMA 240 through access holes in the unit's top cover. Refer to
for details.
3.7 Continued Airworthiness
Maintenance of the GMA 240 is "on condition" only. Refer to the GMA 240 Maintenance Manual
(Garmin P/N 190-00917-02) as needed. Periodic maintenance of the GMA 240 is not required.
Instructions for Continued Airworthiness (ICA) are not required for this product under 14 CFR Part 21 since the GMA 240 has received no FAA approval or endorsement.
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 3-4
4 SYSTEM INTERCONNECTS
4.1 Connector Description
The GMA 240 has two 44-pin connectors located at the rear of the unit designated J2401 and J2402 which
are oriented as shown in Figure 4-1.
4.2 Pin List
J2402 J2401
Figure 4-1 Rear View of Backplate and Rack
Figure 4-2 Rear Connectors J2401 & J2402, Viewed from Back of Unit
6
7
4
5
Pin
1
2
3
, and
Following the pin assignment tables (Table 4-1 &
Table 4-2 ), additional tables group pin connections by
function.
An asterisk (*) following a signal name denotes that the signal is active low logic. Active low inputs are connected to ground to activate. Active low outputs sink current to ground when active.
4.2.1 J2401 Connector
RESERVED
RESERVED
TEL AUDIO IN HI
TEL AUDIO LO
TEL MIC AUDIO OUT HI
RESERVED
AUX2 AUDIO IN HI
Table 4-1 J2401 Pin Assignments
Pin Name
--
OUT
--
IN
I/O
--
--
IN
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-1
Table 4-1 J2401 Pin Assignments
35
36
37
32
33
34
18
19
20
21
14
15
16
17
Pin
8
9
10
11
12
13
26
27
28
29
22
23
24
25
30
31
AUX2 AUDIO IN LO
COM 1 AUDIO IN HI
COM 1 AUDIO LO
COM 1 MIC AUDIO OUT HI
COM 1 MIC KEY* OUT
COM 2 AUDIO IN HI
COM 2 AUDIO LO
COM 2 MIC AUDIO OUT HI
MASQ INHIBIT* IN
NAV 1 AUDIO IN HI
NAV 1 AUDIO IN LO
NAV 2 AUDIO IN HI
NAV 2 AUDIO IN LO
AUX1 AUDIO IN HI
AUX1 AUDIO IN LO
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
CREW ISO* IN
COM 2 MIC KEY* OUT
ALERT 1 AUDIO IN HI
ALERT 1 AUDIO IN LO
PILOT MIC AUDIO IN HI
PILOT MIC KEY* IN
PILOT MIC AUDIO IN LO
RESERVED
RESERVED
Pin Name
41
42
43
38
39
40
RESERVED
RESERVED
PASS HEADSET AUDIO OUT LEFT
PASS HEADSET AUDIO OUT RIGHT
PASS HEADSET AUDIO OUT LO
ALERT 2,3 AUDIO IN LO
44 ALERT 2 AUDIO IN HI
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-2
--
--
--
--
IN
IN
--
IN
--
IN
--
OUT
IN
IN
I/O
--
IN
--
OUT
OUT
IN
--
IN
--
--
--
--
--
--
OUT
IN
--
--
OUT
OUT
--
--
IN
4.2.2 J2402 Connector
Table 4-2 J2402 Pin Assignments
28
29
30
25
26
27
12
13
14
15
8
9
10
11
6
7
4
5
Pin
1
2
3
20
21
22
23
24
16
17
18
19
PILOT HEADSET AUDIO OUT LO
COPILOT HEADSET AUDIO OUT LO
MUSIC 2 IN LO
FAILSAFE WARN AUDIO IN HI
MUTE ON COM TX* IN
Pin Name
COPILOT HEADSET AUDIO OUT LEFT
COPILOT HEADSET AUDIO OUT RIGHT
LIGHTING BUS 14V LO/28V LO
LIGHTING BUS 14V HI/28V LO
LIGHTING BUS 14V HI/28V HI
AIRCRAFT POWER
AIRCRAFT POWER
AIRCRAFT GROUND
AIRCRAFT GROUND
RESERVED
PILOT ISO MUSIC* IN
PILOT ISO MUSIC* RETURN
ALERT 3 AUDIO IN HI
PILOT HEADSET AUDIO OUT LEFT
RESERVED
RESERVED
BUTTON PRESS TONE ENABLE* IN
COM SWAP* IN
COM SWAP* IN RETURN
RESERVED
MUSIC 1 IN LEFT
MUSIC 1 IN RIGHT
MUSIC 1 IN LO
MUSIC 2 IN LEFT
MUSIC 2 IN RIGHT
31
32
33
PILOT HEADSET AUDIO OUT RIGHT
COPILOT MIC AUDIO IN HI
COPILOT MIC KEY* IN
34
35
COPILOT MIC AUDIO IN LO
PASS 1 MIC AUDIO IN HI
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
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Rev. E
GMA 240 Installation Manual
Page 4-3
--
IN
IN
--
IN
IN
--
IN
--
IN
--
--
IN
IN
I/O
--
--
OUT
OUT
--
IN
IN
IN
--
--
IN
IN
OUT
--
--
IN
OUT
IN
IN
--
IN
Table 4-2 J2402 Pin Assignments
Pin
36
37
38
39
40
41
42
43
PASS 1 MIC AUDIO IN LO
PASS 2 MIC AUDIO IN HI
PASS 2 MIC AUDIO IN LO
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
Pin Name
44 RESERVED
* Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
4.2.3 J2403 Connector (front panel 2.5 mm mini-jack)
--
--
--
--
I/O
--
IN
--
--
--
Figure 4-3 2.5 mm Plug Used with J2403
Table 4-3 J2403 Connector
Pin
TIP
Pin Name
MUSIC 1 LEFT IN/TEL MIC OUT HI
RING MUSIC 1 RIGHT IN/TEL AUDIO IN HI
SLEEVE MUSIC 1 LO IN/TEL AUDIO LO
4.3 Aircraft Power and Lighting
4.3.1 Aircraft Power
The GMA 240 has four inputs for aircraft power bus inputs of 14/28Vdc.
Pin
8
9
10
11
Connector
J2402
J2402
J2402
J2402
Table 4-4 Aircraft Power
Pin Name
AIRCRAFT POWER
AIRCRAFT POWER
POWER GROUND
POWER GROUND
190-00917-01
Rev. E
I/O
I/O
IN
--
I/O
IN
IN
--
--
GMA 240 Installation Manual
Page 4-4
4.3.2 Lighting Bus
The GMA 240 photocell controls the brightness of the LEDs (annunciators) that show selection of functions (e.g. rectangular LEDs in the buttons).
The external lighting bus (if used) input on pins 5, 6, & 7 (P2402), should be connected as shown in
the background of the button fields (e.g. “MUTE MUSIC”). The lighting bus must be capable of supplying 160 mA at 14 V or 100 mA at 28 V to provide backlight power to these pins at full brightness. If pins 5, 6, & 7 are not connected, the text labeling will not be backlit.
Pin
5
6
7
Connector
J2402
J2402
J2402
Table 4-5 Lighting Bus
Pin Name
LIGHTING BUS 14V LO/28V LO
LIGHTING BUS 14V HI/28V LO
LIGHTING BUS 14V HI/28V HI
I/O
--
IN
IN
4.4 Configuration Pins
4.4.1 External Configuration Pins
The following pins may be used to change the configuration of the installation as described.
Table 4-6 External Configuration Pins
Pin
16
29
Connector
J2401
J2401
CREW ISO*
IN
Pin Name
MASQ
INHIBIT* IN
Description
Ground to disable Master Avionics Squelch circuitry. This will cause alerts and selected radios to be heard at all times without needing to exceed the mute threshold. This causes an increase in background noise from the inputs during quiet output.
Ground to configure the unit for CREW ICS isolation. In this configuration, the copilot headset jack should be wired in parallel with the pilot headset output. The mics are wired as normal. In this mode, when the PILOT ISO button is selected, the pilot and copilot will hear each other, but will be intercom isolated from the passengers.
Ground to allow Music audio to be heard by the pilot during pilot isolate mode.
13
19
J2402
J2402
PILOT ISO
MUSIC* IN
BUTTON
PRESS
TONE
ENABLE* IN
Ground to enable beep tone annunciation of button presses
30 J2402
MUTE ON
COM TX* IN
*Denotes Active Low (Ground to activate)
Ground to enable muting of other selected radios during mic selected COM transmission (mic-selected COM is still heard, but not other selected radios)
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-5
4.5 Audio Inputs/Outputs and Mic Keys
4.5.1 Mic Audio Inputs and Mic Keys
Table 4-7 Mic Audio Inputs and Mic Keys
35
32
34
35
Pin
34
33
33
Connector
J2401
J2402
J2401
J2401
J2402
J2402
J2402
Pin Name
PILOT MIC KEY* IN
COPILOT MIC KEY* IN
PILOT MIC AUDIO IN HI
PILOT MIC IN LO
COPILOT MIC AUDIO IN HI
COPILOT MIC IN LO
PASS 1 MIC AUDIO IN HI
36
37
J2402
J2402
PASS 1 MIC AUDIO IN LO
PASS 2 MIC AUDIO IN HI
38 J2402 PASS 2 MIC AUDIO IN LO
*Denotes Active Low (Ground to activate)
Description
Enables respective MIC audio into the selected transceiver unit
Pilot Mic audio input and ground reference
Copilot Mic audio input and ground reference
Passenger 1 Mic audio and ground reference
Passenger 2 Mic audio and ground reference
4.5.2 Intercom Key Inputs (if configured)
These inputs only perform the described ICS KEY function if the audio panel has been configured for
KEYED ICS by configuration jumper settings (
). For this configuration, intercom squelch
levels should be set fully CCW (live MIC) because the MIC signal must also break the VOX threshold to be heard.
Table 4-8 Intercom Key Inputs
Pin
17
36
37
Connector
J2402
J2401
J2401
Pin Name
PILOT ICS KEY* IN
COPILOT ICS KEY* IN
PASSENGER ICS KEY* IN
*Denotes Active Low (Ground to activate)
Description
Enables respective mic audio to be heard in the intercom
--
IN
--
IN
I/O
IN
IN
IN
--
IN
--
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-6
4.5.3 COM Audio and Mic Keys
Table 4-9 COM Audio and Mic Keys
Pin
12
30
9
11
10
13
15
Connector
J2401
J2401
J2401
J2401
J2401
J2401
J2401
Pin Name
COM 1 MIC KEY* OUT
COM 2 MIC KEY* OUT
COM 1 AUDIO IN HI
COM 1 MIC AUDIO OUT HI
COM 1 AUDIO LO
COM 2 AUDIO IN HI
COM 2 MIC AUDIO OUT HI
Description
Enables transmission on the respective transceiver unit
COM 1 Audio Input
COM 1 Audio Output
Ground Reference for COM 1
COM 2 Audio Input
COM 2 Audio Output
14 J2401 COM 2 AUDIO LO Ground Reference for COM 2
*Denotes Active Low (Sinks current to ground when active)
Pin
31
32
44
15
43
4.5.4 Alert Audio I/O
Connector
J2401
J2401
J2401
J2402
J2401
Table 4-10 Alert Audio I/O
Pin Name
ALERT 1 AUDIO IN HI
ALERT 1 AUDIO IN LO
ALERT 2 AUDIO IN HI
ALERT 3 AUDIO IN HI
ALERT 2,3 AUDIO IN LO
Description
Alert 1 Audio Input
Ground Reference for Alert 1
Alert 2 Audio Input
Alert 3 Audio Input
Ground Reference for Alert 2 & 3
4.5.5 AUX and NAV Audio Inputs
8
17
18
19
20
Pin
21
22
7
Connector
J2401
J2401
J2401
J2401
J2401
J2401
J2401
J2401
Table 4-11 AUX and NAV Audio Inputs
Pin Name
AUX1 AUDIO IN HI
AUX1 AUDIO IN LO
AUX2 AUDIO IN HI
AUX2 AUDIO IN LO
NAV 1 AUDIO IN HI
NAV 1 AUDIO IN LO
NAV 2 AUDIO IN HI
NAV 2 AUDIO IN LO
Description
AUX1 Audio Input
Ground Reference for AUX1 Input
AUX2 Audio Input
Ground Reference for AUX2 Input
NAV 1 Audio Input
NAV 1 Ground Reference
NAV 2 Audio Input
NAV 2 Ground Reference
I/O
OUT
OUT
IN
OUT
--
IN
OUT
--
I/O
IN
--
IN
IN
--
--
IN
--
IN
--
I/O
IN
--
IN
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-7
4.5.6 Failsafe Warning Audio
Pin
29
Connector
J2402
Table 4-12 Failsafe Warning Audio
Pin Name
FAILSAFE WARN AUDIO IN HI
Description
Failsafe Warning Audio Input
26
27
28
Pin
23
24
25
4.5.7 Music Inputs
Connector
J2402
J2402
J2402
J2402
J2402
J2402
Table 4-13 Music Inputs
Pin Name
MUSIC 1 IN LEFT
MUSIC 1 IN RIGHT
MUSIC 1 IN LO
MUSIC 2 IN LEFT
MUSIC 2 IN RIGHT
MUSIC 2 IN LO
Description
Music 1 Input
Ground Reference for Music 1
Music 2 Input
Ground Reference for Music 2
4.5.8 Tel Audio I/O
Pin
3
4
5
Connector
J2401
J2401
J2401
Table 4-14 Tel Audio I/O
Pin Name
TEL AUDIO IN HI
TEL AUDIO LO
Description
Telephone Audio Input
Ground Reference for Telephone
TEL MIC AUDIO OUT HI TEL MIC Audio Output
I/O
IN
I/O
IN
--
OUT
IN
IN
--
I/O
IN
IN
--
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-8
4.5.9 Headset Outputs
Pin
16
31
1
3
4
2
40
41
42
Connector
J2402
J2402
J2402
J2402
J2402
J2402
J2401
J2401
J2401
Table 4-15 Headset Outputs
Pin Name
PILOT HEADSET AUDIO
OUT LEFT
PILOT HEADSET AUDIO
OUT RIGHT
PILOT HEADSET AUDIO
OUT LO
COPILOT HEADSET AUDIO
OUT LEFT
COPILOT HEADSET AUDIO
OUT RIGHT
COPILOT HEADSET AUDIO
OUT LO
PASS HEADSET AUDIO
OUT LEFT
PASS HEADSET AUDIO
OUT RIGHT
PASS HEADSET AUDIO
OUT LO
Description
Pilot Headset Audio Output
Copilot Headset Audio Output
I/O
OUT
OUT
--
OUT
OUT
--
Passenger Headset Audio Output OUT
OUT
--
NOTE
Copilot and Passenger headset outputs are internally the same connection. Separate
Passenger headset output pins are provided for wiring convenience and GMA 340 pin compatibility.
NOTE
For CREW ISO configuration, the copilot's headphone jack should be wired in parallel with the pilot jack to the Pilot headset output pins. Passengers may be connected to either the copilot or passenger pins.
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-9
NOTE
Using a mono headset with an audio jack wired for stereo may damage the GMA 240.
Installations using only mono headsets may use a stereo audio jack and leave the ring contact unconnected or install a switch as shown in Figure 4-4. Also note that many stereo headsets have a mono/stereo switch to be compatible with mono or stereo-wired jacks.
HEADSET LEFT OUTPUT
MONO
HEADSET RIGHT OUTPUT
STEREO
HEADSET LO OUTPUT
Figure 4-4 Audio Jack Wiring
4.5.10 COM Swap
Pin
20
21
Connector
J2402
J2402
TIP
RING
SLEEVE
Table 4-16 COM Swap
Pin Name
COM SWAP* IN
COM SWAP RETURN
Description
Ground Through a Momentary PB
Switch to Swap Active COM (COM 1 or COM 2)
Return Path for PB Switch
I/O
IN
--
190-00917-01
Rev. E
GMA 240 Installation Manual
Page 4-10
APPENDIX A Outline and Installation Drawings
190-00917-01
Revision E
Figure A-1 GMA 240 Outline Drawing
GMA 240 Installation Manual
Page A-1
APPENDIX A Outline and Installation Drawings
190-00917-01
Revision E
Figure A-2 GMA 240 Connector/Rack Assembly Drawing
GMA 240 Installation Manual
Page A-2
APPENDIX A Outline and Installation Drawings
190-00917-01
Revision E
Figure A-3 GMA 240 Recommended Panel Cutout Dimensions
GMA 240 Installation Manual
Page A-3
APPENDIX B Interconnect Drawings
190-00917-01
Revision E
Figure B-1 GMA 240 Interconnect Drawing (page 1 of 3)
GMA 240 Installation Manual
Page B-1
APPENDIX B Interconnect Drawings
190-00917-01
Revision E
Figure B-1 GMA 240 Interconnect Drawing (page 2 of 3)
GMA 240 Installation Manual
Page B-2
APPENDIX B Interconnect Drawings
190-00917-01
Revision E
Figure B-1 GMA 240 Interconnect Drawing (page 3 of 3)
GMA 240 Installation Manual
Page B-3
APPENDIX B Interconnect Drawings
G M A 2 4 0 J 2 4 0 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2
COM 2 MIC
AUDIO OUT HI
COM 2 AUDIO COM 2 AUDIO
LO IN HI
COM 1 MIC
KEY* OUT
COM 1 MIC
AUDIO OUT HI
COM 1 AUDIO
LO
COM 1 AUDIO
IN HI
AUX2 AUDIO
IN LO
AUX2 AUDIO
IN HI
RESERVED TEL MIC
AUDIO OUT HI
TEL AUDIO LO TEL AUDIO IN
HI
RESERVED
1
RESERVED
30 29 28
COM 2 MIC
KEY* OUT
CREW ISO* IN RESERVED
27
RESERVED
26
RESERVED
25
RESERVED
24
RESERVED
23
RESERVED
22 21 20 19 18 17 16
AUX1 AUDIO
IN LO
AUX1 AUDIO
IN HI
NAV 2 AUDIO
IN LO
NAV 2 AUDIO
IN HI
NAV 1 AUDIO
IN LO
NAV 1 AUDIO
IN HI
MASQ
INHIBIT* IN
44
ALERT 2
AUDIO IN HI
43
ALERT 2,3
AUDIO IN LO
42
PASS
HEADSET
AUDIO OUT
LO
41
PASS
HEADSET
AUDIO OUT
RIGHT
40
PASS
HEADSET
AUDIO OUT
LEFT
39
RESERVED
38
RESERVED
37
RESERVED
36
RESERVED
35
PILOT MIC
AUDIO IN LO
34
PILOT MIC
KEY* IN
33
PILOT MIC
AUDIO IN HI
32
ALERT 1
AUDIO IN LO
31
ALERT 1
AUDIO IN HI
G M A 2 4 0 J 2 4 0 2
15
ALERT 3
AUDIO IN HI
30
MUTE* ON
COM TX IN
14
PILOT ISO
MUSIC*
RETURN
29
13
PILOT ISO
MUSIC* IN
FAILSAFE
WARN AUDIO
IN HI
28
MUSIC 2 IN LO
12
RESERVED
27
MUSIC 2 IN
RIGHT
11
AIRCRAFT
GROUND
26
MUSIC 2 IN
LEFT
10
AIRCRAFT
GROUND
25
MUSIC 1 IN LO
9
AIRCRAFT
POWER
24
MUSIC 1 IN
RIGHT
8
AIRCRAFT
POWER
23
MUSIC 1 IN
LEFT
7
LIGHTING
BUS 14V
HI/28V HI
22
RESERVED
6
LIGHTING
BUS 14V
HI/28V LO
21
COM SWAP*
IN RETURN
5
LIGHTING
BUS 14V
LO/28V LO
4
COPILOT
HEADSET
AUDIO OUT
RIGHT
19 20
COM SWAP*
IN
BUTTON
PRESS TONE
ENABLE* IN
3
COPILOT
HEADSET
AUDIO OUT
LEFT
18
2
COPILOT
HEADSET
AUDIO OUT
LO
17
1
PILOT
HEADSET
AUDIO OUT
LO
16
RESERVED RESERVED PILOT
HEADSET
AUDIO OUT
LEFT
44
RESERVED
43
RESERVED
42
RESERVED
41
RESERVED
40
RESERVED
39
RESERVED
38
PASS 2 MIC
AUDIO IN LO
37
PASS 2 MIC
AUDIO IN HI
36
PASS 1 MIC
AUDIO IN LO
35
PASS 1 MIC
AUDIO IN HI
34 33 32
COPILOT MIC
AUDIO IN LO
COPILOT MIC
KEY* IN
COPILOT MIC
AUDIO IN HI
31
PILOT
HEADSET
AUDIO OUT
RIGHT
190-00917-01
Revision E
Figure B-2 GMA 240, J2401 & J2402 Connector Layout Drawing
GMA 240 Installation Manual
Page B-4
APPENDIX C Configuration Jumpers Drawing
Top of Main Board Bottom of Main Board
190-00917-01
Revision E
Figure C-1 GMA 240 Internal Configuration Jumper Layout Drawing
GMA 240 Installation Manual
Page C-1
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